"The new 14 inch FHD (1,920 x 1,080) screens offer a brightness value of 400 cd/m² and they are supposed to cover 72 % of the NTSC color gamut. Their most important feature is supposed to be the lower power consumption compared with other screens.
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such a Low Power FHD screen at the moment, we can answer these questions, at least partly. The LCD screen with the model number NE140FHM-N61 used in our review unit was made by BOE. It really does seem to lower the power consumption, as the average Idle power consumption compared with the ThinkPad T480 (which contained a normal FHD IPS screen) is lower by 41 %.
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Thanks to Panelook, we know how Lenovo achieved this lower power consumption, too. The BOE NE140FHM-N61 is an IGZO screen. IGZO displays are normal IPS LCDs, which use Indium Gallium Zink Oxide instead of amorphous Silicon (a-Si) as the backplate-material of the LCD. IGZO screens are more expensive than normal a-Si LCDs, but their biggest advantage is their lower power consumption. ..."

We were obviously eager to find out how the new Low Power display affects the power measurements, and we can really see reduction in the idle measurements compared to the T480s. The device only consumes 6.36W at the highest luminance. This value also shows that the keyboard illumination could be improved because it requires 2.3W on the brightest setting. You should therefore only use the weaker background illumination (only ~0.6W) for longer battery runtimes.